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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe3a22033563ca173ec77970f7d38dc9864fdd6e4da0bc32095932e4ce5985e' 
  AND token = 'l0dK0XOYUvh9N8QtIIProk84fmvUpxmfI/RfB4hjnWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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