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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4ae54ac0459560e3295fb88fbcd2ed207ddf7de833c44cb117686c6eda31c1' 
  AND token = 'YDssAuEyp1sxpUoTvJYykDBhV8cy4PokdSbwkZU939E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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