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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7413db2ffb7277365c057a04f60d14d3ccf8a82747de62426a1a7aae2f6c16' 
  AND token = 'jjz0twWLLnu3Bu7SddzWtEZxP80D1RNkyLYyGLbH+y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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