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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d5e3a90614800af1287f0faa085e51e339af3ea8b3d2d77847b81e7c22a7a3' 
  AND token = 'QkOAkvjO2IhsGsGPhXxF/AZVl9DR5n2jW571aMdU2pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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