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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafab0b0e87f584ce41514da2aff52ae9265e485e8ec4920b68876bd177dac8d' 
  AND token = 'l/NL5+ntTDYZiRLjTEJX7e6Xn41nPl3V61mwa46N9OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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