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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c35d49815b1defe7944ffa3550e82593efd4b306a1741d42b78dee79552191f' 
  AND token = 'jnA2srkcw/UP3+vFk+JcWZlESYj+341Y7DYdxkWlMQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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