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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beedad852a5bbc83a12a3d3d009b72b563db9395a286c34c02940bdacc7c545a' 
  AND token = 'SJtXLUiSp1ApevUxXQDAZqklv48Dmu7L1a9PTUVhFaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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