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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f90532a11fdb69b3782ba2ebfabae1fd98bd98052c0f98e5f1f72f04f0fa20a' 
  AND token = 'JMCoTQiyT8Uir88q0ma6cwV1g/7q1UHX7pqY5+X2ASo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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