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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c72005f8d26e5aa5ae6e653e18a2b2976b47942d3ad2fcadb8f059adcdd08c2' 
  AND token = 'F4LZHvptwvvgVMk1RDCBUAjsM7lns8teOz212xP0HZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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