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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f009d9bfca69ec384c7ab527bad4e45e8f32dfd4fc943368d66aebed2bab1bea' 
  AND token = 'Twoq31oJWzU8C6rjv5Qr352fNpYNoB0V93ByChVVBGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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