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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a1dc34844b2195d20b32572e4405e61ee1e33b29ada237f9797e34b6291826' 
  AND token = '3sgkVbqLZA+FZzkIqE45KLpiYFOZDIyTgfVecx/2v5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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