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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5d7d513771076acf2891a87e514d92483832f0fbf87ee7ac226e58453a7e4d' 
  AND token = 'Ac2M0lnO8n9AwpbuBQWlHGMtApnzcvtV2GL+TP7cQOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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