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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d95dbf122fda94e3603a5bb26e9583692c6800a19020c4ca2ac43f831112ef3' 
  AND token = 'kCxGwZdb9k2DLpDFQEojQZ9gDVPIKdsy0BiHU0CGRrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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