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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c411ad010dae1d076290384679313e126af2d81e40be7ab19cd60206150e0962' 
  AND token = '2qe0VM7O6LsxSw4a1wNp8sDpPxQWrFN3T+ms9gkg6Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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