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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e3dfa6e34eb2952712904c9e52b349224d386d55a4ef7b511296f20c5bee4e' 
  AND token = 'lDPhLWfkfCliktdF4ngfzH5Hq3Rr2IGb/DA0FSKp2LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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