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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863b12d71e2a629743f2dc97ed9295dad854bf4e5b8cac5c5c2434b8b2beb097' 
  AND token = 'lejNRh1ix5GQ/4R6I+TnHJ4iyF/MJRJUG5hpnYASt5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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