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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cd47516431d5161dfe75e214b1ce1ce226cdb0143fe8a74e2ed606cb483dc0' 
  AND token = 'o3DpH2LYcwbS3eCQPcbYEcbb7XbOWY5L2Eh47f7GX8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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