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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07856f5843c99647b086c6e1e8cdbdd01de414372a51e1ca655a9405751d78a3' 
  AND token = 'ya7gOC5FBd90EACBpF1QCSXm0Op8NLAazneSgL7XvbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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