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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9889b19eed1d4aacc23a150c7a120b8d16bc47d3eeb94215ce6b637e0689af25' 
  AND token = 'EX552RJp7hThsZEydN5wVIHY5kYwmj+DMG14Qrgak+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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