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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e327b19749a1996e5af74276c17ebbfb7373f58b97d849d0ac062b071dd527' 
  AND token = 'g0IdyvY5x/csuihHW2InKb8unQpv+52VEFL2ONgvj4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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