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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a5ea38e602db0f61ff6ce06fa3d9498cffde1aeffb0f37bb1855c29a477c96' 
  AND token = 'abMT8ymahac0yLbSNROB9kB0cCbSofxsz610KDyARCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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