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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb27d1eff32f837f846045b98e1f9cfc3b2a13c2e8824bad668359ddec5f40cb' 
  AND token = '3FJOz0psju68VYT5jheBOyS/cw5fOpQo4GcXAUbwQLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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