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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e2e782c26f54e8f6ee1d3cd754d6a21a9dcc09c0b1885586fef76c36e3c7a1' 
  AND token = 'QOikkXdJJvKKlgND5UTWUSBp14uEAjo8Ok8k2sdEbpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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