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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbeb015eaca03211ac1cecc934a2bed41d578e417527950ec5183863ca4f00d8' 
  AND token = 'o4K0oLxybzLBCKEikD2ursgHqssfPmOGu3x0soSHGqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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