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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bc92879aacf6eb30e2934033e3aeefaaeb2ce036d002c6a78e94eb704fd43a' 
  AND token = 'Sg594ZklemNE5E+Z/0yxfKI/IzuiVM5UrGB2ONdy/Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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