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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5f9eb3af024a3974c37759368a6f7d9f6174be73e7e50ee30727a27aca45c1' 
  AND token = 'fi2vhBowH6Ng/OaPl067BPkbEeAOwOPPEJzeNFzcZeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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