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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a7300f52e1dc2ebc1ab888668b2e8f583f8d7b0dff3d06ffe6c5f2bb0c3160' 
  AND token = 'ERNjAMGYzrzFuffHcr8gfQvcdSuyat7KggVCGXHqPco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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