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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d1eea7dffa4338559f42da1773f7e93973d3cf0bb1ddbe0a7e6986d9536029' 
  AND token = 'Y6Nw3iAGLM+SZLkNMD2f/FICsgcJm7DnG3k5JzUUsv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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