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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed84f882da5dd51510e6946b359441e03368dac5222ac3fd8087cea3edfea56' 
  AND token = 'GDiKnLahNWrOSRJQZMCxgRqs1HshR/nZlNsb6f34Kv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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