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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a09f4e84105feb8b71311792b5773af8f1fbabfc1c0d417167cc5d4b2554d5' 
  AND token = 'nuNY3N+J6W3YT3ILU4CvhFlKOfx1f6oWmEDFkh52lr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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