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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfaa8ac460057da1c5c5516648913e8b4b8206e8f1e38f3f1851c1f90ca309af' 
  AND token = '7Hjsekt41ZmEuILBXa2SEXBD/diPBgEzPp/YAWIt7ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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