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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dcd4098ecb0b0b58a5f8b381e347e94d2b576492bc6b60d2d02717373b24123' 
  AND token = 'AYPHX+Cy/Yub/zil+5512s1/MaTxlOtcfU2GPHZrAuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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