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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c91a30112929ffcf6f1f2c8ef86933200dc2ac36192edc46b1b9741db3f0e6' 
  AND token = 'xXRjsWl1Dj7qy0eBm9vBXOSG8zi6HCiYKN7TnWYnYv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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