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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb82ed55d4219ef03db90a7c6e578ecb3e5e40584ecd0efbcff409bd9eaad4e' 
  AND token = 'sFiiT+/dCR/pJ49UTe96iRFqyeLsrg0tAr4GELNosT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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