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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dc47d46d66f16227d2fa45b7b587b504d9f505fdcb7c25b0ce3d84664d8437' 
  AND token = 'uovwfJ5tk4OSvyxkB8RI3DRRDf1O6abZyowbtA6yx4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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