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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b29b91cd416c771c853f445a80b0a6799d4c4a804ca53ed476832d76a69689' 
  AND token = 'qqxIsI5dnJnoiI72pRWzktcy77Ew5gs5AaEPGJyb704=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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