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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a905b51f3d1a89cc62c45d6b9b79ea54e67b5a8843a28ba273b8a66e33938d' 
  AND token = '60h094QLiCN1E6c1R0kCcbtJOyCrAU/1i6g8Y775ZCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}