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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8c4a2ff79c39733f5f5516f251f199289140c2b1170d71158029ef85e08d23' 
  AND token = '/Td+gyqjVVLseMyzv+mdEA0ukPpFvDe/gmasuSi+ELU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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