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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ed7766b1069322bc3333d2620955383cacf84c89f29f6cfdc53d732c97424d' 
  AND token = 'm2l39ZvWiNYlUskPwXbBe4W20pM5IQmx3r5pNtbF1zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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