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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f09a1c95a68c640ee4793fb1e22ba348a071eec88a2342df4d26dbf102096e' 
  AND token = '2HbAL3KI6Uj+Mjyh4dxFUo2xwWz8C/xpetehXdek7Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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