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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e013a389626acead72ddd851082b4da7e6ce27f3c093dfe7c53435de38a793ae' 
  AND token = 'SivNmOHkReezZdW20lkANo/Qjf73M3SGFmVbspuj8q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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