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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe707fa4b8f7e02fa97cac9734b78a6af7bb7906dd79d8affa725db0d50fb83' 
  AND token = 'HMpOKoDTZGLqv9xfMaKKqgsKEn8mf9KHqkPNSBiilTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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