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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396280738284ff3a276aea208b74e1231291effdcd2a30a59ff59dc6c773672b' 
  AND token = 'Ys/Du1UnAQvUlkggx695MtB6XhL8u3F3lf51dKq2cuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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