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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dcc903c1f58392df432ad18c61074ac7ec867ff1461ba2205928e72d6deacb' 
  AND token = 'UuXA5v+PSwIQsVvdV0zVGVtvGAiRDWb4ALrOT+si/t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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