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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411fd64ada8946624467ef0e14a30c915604e667e251c316ebe969d2e5623d92' 
  AND token = 'HWgVKPjkSUQtcc1BQa0Ri/F+RTuA6RZAFlCRbzTC8AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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