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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e032296c7349436556f88d704d67bc5992ceb4b54b177f0bbb769e8493ee55' 
  AND token = 'tAz4lCGyQVffSGaDD4T4gXlyr6Off4KWFBnOnNbsopc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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