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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd989dcdcbc997b14503b71145666cd4a8eceaea904c4f3c06616045517929c27' 
  AND token = 'DzCAZ5gXrG9NL66huHea4wrFQ6NWHkCk6tqJ8og6bXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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