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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edba0aeeb4dbc475ccbf126727ad432f0f638baccb60a00fad8868612b2210a4' 
  AND token = 'phiIw+hjsLyz4qbMk8soWXLL/+WU/2ZzT/goBf+SNSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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