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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860fe60a110cc173e464bbf3763d62bb7ad7b4e3aeb1e01faf15395b00fd1093' 
  AND token = 'u9Tcu1DUXh71vm7A3tw+HUZnLKFyMMMc6t5RWf3xIMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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