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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b85b5ab019107285587afe80f8fc7f83a0dc5591a91f4f3af1805eb2d185b2' 
  AND token = 'fu6pOHfxG//nyAv0oG4f0tzbk01wNtTIl15ygFdx4n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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