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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363278b5f8596adbb4b3df9b6b1392d4c0404500073d7bcb28ae26cce6ee9d61' 
  AND token = '5T9nI8bSbUycoNtM3ErLqANenB+gXHWWeph8HtgfxJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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