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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea986c692a2a3f89216d1f8e0dc802d24c662ea492b3ed7d2b0b007ca065db11' 
  AND token = 'oLWT9i1V6wuIU1J/9PkMKpnEkXxtPsbElpfUjw66KB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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