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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b6db7c88716b3027d640a9d6aba7538fdc3488587710d34780e6657c4e43d5' 
  AND token = 'OS4eSX/sCZC+KvLEHl6baSxjwAIQN3D7tsl9IAADsiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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