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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be97f6385087e22c201ab6830c447b2b16ab07ff93508eb2ebb8efdf81846c8' 
  AND token = 'KS1MAZxv5kRE/kaJ97rJMR+Fbm953kr1+NdsZRhZBWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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