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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4ee6e3c73e0186590cc928c1ec5fa399bf2117f16f8038a05175906922cc98' 
  AND token = 'hSgpPNM87ORtvQwJLDhM9IF95SI3teZBuLt8fKEBz7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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