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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff095f3f110a6448dc3e7082d56018385ea43a777f0fa9aec11b622bab4b651c' 
  AND token = '1x6tY73AWygRhnqO9LlrC10MYM+ZatXmHBjcON6XIBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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